Discovery of microchromosomes in wheat and their special behavior in meiosis

摘要

THERE are 42 chromosomes in common wheat ( Triticum aestivum L). The extra microchromosomes were discovered in alloplasmic lines of common wheat with cytoplasms of Ae. muti-ca, Secale cereale, Elytrigia elongatum and Agropyron glaucum. The microchromosomes were discovered in amphiploid of Triticum aestivum-Secale cereale (DDRR) too. These microchromosomes are telocentric, shorter than normal chromosomes of wheat, and carry the genes of fertility restoration. The discovery of microchromosomes in fertile 4D nullisomics of common wheat and their special behavior in meiosis are reported in the paper.